Results 1  10
of
72
Dielectric branes
 JHEP
, 1999
"... Preprint typeset in JHEP style PAPER VERSION ..."
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Flavor Superconductivity from Gauge/Gravity Duality
, 2009
"... We give a detailed account and extensions of a holographic flavor superconductivity model which we have proposed recently. The model has an explicit field theory realization as strongly coupled N = 2 Super YangMills theory with fundamental matter at finite temperature and finite isospin chemical ..."
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Cited by 47 (12 self)
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We give a detailed account and extensions of a holographic flavor superconductivity model which we have proposed recently. The model has an explicit field theory realization as strongly coupled N = 2 Super YangMills theory with fundamental matter at finite temperature and finite isospin chemical potential. Using gauge/gravity duality, i. e. a probe of two flavor D7–branes in the AdS black hole background, we show that the system undergoes a second order phase transition with critical exponent 1/2. The new ground state may be interpreted as a ρ meson superfluid. It shows signatures known from superconductivity, such as an infinite dc conductivity and a gap in the frequencydependent conductivity. We present a stringy picture of the condensation mechanism in terms of a recombination of strings. We give a detailed account of the evaluation of the nonAbelian DiracBornInfeld action involved using two different methods. Finally we also consider the case of massive flavors and discuss the holographic Meissner–Ochsenfeld effect in our
Finite Temperature Large N Gauge Theory with Quarks
 in an External Magnetic Field, JHEP 07 (2008) 080, [arXiv:0709.1547
"... Using a ten dimensional dual string background, we study aspects of the physics of finite temperature large N four dimensional SU(N) gauge theory, focusing on the dynamics of fundamental quarks in the presence of a background magnetic field. At vanishing temperature and magnetic field, the theory ha ..."
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Cited by 30 (6 self)
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Using a ten dimensional dual string background, we study aspects of the physics of finite temperature large N four dimensional SU(N) gauge theory, focusing on the dynamics of fundamental quarks in the presence of a background magnetic field. At vanishing temperature and magnetic field, the theory has N = 2 supersymmetry, and the quarks are in hypermultiplet representations. In a previous study, similar techniques were used to show that the quark dynamics exhibit spontaneous chiral symmetry breaking. In the present work we begin by establishing the non–trivial phase structure that results from finite temperature. We observe, for example, that above the critical value of the field that generates a chiral condensate spontaneously, the meson melting transition disappears, leaving only a discrete spectrum of mesons at any temperature. We also compute several thermodynamic properties of the plasma. 1 1
Holographic anatomy of fuzzballs
 JHEP
, 2007
"... We present a comprehensive analysis of 2charge fuzzball solutions, that is, horizonfree nonsingular solutions of IIB supergravity characterized by a curve on R4. We propose a precise map that relates any given curve to a specific superposition of R ground states of the D1D5 system. To test this ..."
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Cited by 28 (4 self)
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We present a comprehensive analysis of 2charge fuzzball solutions, that is, horizonfree nonsingular solutions of IIB supergravity characterized by a curve on R4. We propose a precise map that relates any given curve to a specific superposition of R ground states of the D1D5 system. To test this proposal we compute the holographic 1point functions associated with these solutions, namely the conserved charges and the vacuum expectation values of chiral primary operators of the boundary theory, and find perfect agreement within the approximations used. In particular, all kinematical constraints are satisfied and the proposal is compatible with dynamical constraints although detailed quantitative tests would require going beyond the leading supergravity approximation. We also discuss which geometries may be dual to a given R ground state. We present the general asymptotic form that such solutions must have and present exact solutions which have such asymptotics and therefore pass all kinematical constraints. Dynamical constraints would again require going beyond the leading supergravity approximation. Contents
Symmetrybreaking vacua and baryon condensates in ads/cft
, 2008
"... We study the gravity duals of symmetrybreaking deformations of superconformal field theories, AdS/CFT dual to Type IIB string theory on AdS5 × Y where Y is a SasakiEinstein manifold. In these vacua both conformal invariance and baryonic symmetries are spontaneously broken. We present a detailed di ..."
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Cited by 26 (7 self)
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We study the gravity duals of symmetrybreaking deformations of superconformal field theories, AdS/CFT dual to Type IIB string theory on AdS5 × Y where Y is a SasakiEinstein manifold. In these vacua both conformal invariance and baryonic symmetries are spontaneously broken. We present a detailed discussion of the supergravity moduli space, which involves flat form fields on asymptotically conical CalabiYau manifolds, and match this to the gauge theory vacuum moduli space. We discuss certain linearised fluctuations of the moduli, identifying the Goldstone bosons associated with spontaneous breaking of nonanomalous baryonic symmetries. The remaining moduli fields are related to spontaneous breaking of anomalous baryonic symmetries. We also elaborate on the proposal that computing condensates of baryon operators is equivalent to computing the partition function of a noncompact Euclidean D3brane in the background supergravity
Baryonic branches and resolutions of Ricciflat Kähler cones
, 2007
"... We study deformations of N = 1 superconformal field theories that are AdS/CFT dual to Type IIB string theory on SasakiEinstein manifolds, characterised by nonzero vacuum expectation values for certain baryonic operators. Generally, such baryonic branches are constructed from (partially) resolved, ..."
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Cited by 22 (7 self)
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We study deformations of N = 1 superconformal field theories that are AdS/CFT dual to Type IIB string theory on SasakiEinstein manifolds, characterised by nonzero vacuum expectation values for certain baryonic operators. Generally, such baryonic branches are constructed from (partially) resolved, asymptotically conical Ricciflat Kähler manifolds, together with a choice of point where the stack of D3branes is placed. The complete solution then describes a renormalisation group flow between two AdS fixed points. We also discuss the use of probe Euclidean D3branes in these backgrounds as a means to compute expectation values of baryonic operators. The Y p,q theories are used as illustrative examples throughout the paper.
A Holographic Quantum Critical Point at Finite Magnetic Field and Finite Density
 JHEP
, 2010
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The StressEnergy Tensor of Flavor Fields from AdS/CFT
"... Abstract: We use the AdS/CFT correspondence to study the transport properties of massive N = 2 hypermultiplet fields in an N = 4 SU(Nc) superYangMills theory plasma in the large Nc, large ’t Hooft coupling limit, and in the presence of a baryon number chemical potential and external electric and m ..."
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Cited by 20 (2 self)
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Abstract: We use the AdS/CFT correspondence to study the transport properties of massive N = 2 hypermultiplet fields in an N = 4 SU(Nc) superYangMills theory plasma in the large Nc, large ’t Hooft coupling limit, and in the presence of a baryon number chemical potential and external electric and magnetic fields. In particular, we compute the flavor fields’ contribution to the stressenergy tensor. We find infrared divergences in the stressenergy tensor, arising from the flavor fields ’ constant rate of energy and momentum loss. We regulate these divergences and extract the energy and momentum loss rates from the divergent terms. We also check our result in various limits in which the divergences are absent. The supergravity dual is a system of D7branes, with a particular configuration of worldvolume fields, probing an AdSSchwarzschild background. The supergravity calculation amounts to computing the stressenergy tensor of the D7branes.